美国国家癌症研究所根据美国农业部1989～1991年个人食物摄入量定调查结果公布了27种营养素的主要食物来源和美国成年人的膳食构成。该调查使用了一种新的分析方法,即将食物分解成各种组分进行研究。此外,由于这些年来人们的食物消 The National Cancer Institute published the main food sources of 27 nutrients and the dietary composition of American adults based on findings of the USDA’s personal food intake from 1989 to 1991. The survey used a new method of analysis that broke down food into components for research. In addition, due to the people’s food consumption over the years